serveral reasons...
1. It's something that I feel (or at least used to feel) that I could control
2. It's a form of self-punishment for things, and to punish aeras of the body that feel like have betrayed us
3. In an attempt to make the body disgusting and awful so that noone would ever want to be near it and so noone could hurt it/us
4. To feel that people care and that we matter - as we generally only feel loved or cared about when hurt/ill/injured
5. As a sort of grounding method for flashbacks and dissociation
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